1 files changed, 217 insertions, 128 deletions

diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index fbd61396871..aeed9ea7971 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -1,9 +1,12 @@
 /*
- * Normal mappings of chips in physical memory for OF devices
+ * Flash mappings described by the OF (or flattened) device tree
  *
  * Copyright (C) 2006 MontaVista Software Inc.
  * Author: Vitaly Wool <vwool@ru.mvista.com>
  *
+ * Revised to handle newer style flash binding by:
+ *   Copyright (C) 2007 David Gibson, IBM Corporation.
+ *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
@@ -12,102 +15,157 @@
 
 #include <linux/module.h>
 #include <linux/types.h>
-#include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/partitions.h>
-#include <linux/mtd/physmap.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/of_device.h>
-#include <asm/of_platform.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
-struct physmap_flash_info {
+struct of_flash {
 	struct mtd_info		*mtd;
 	struct map_info		map;
 	struct resource		*res;
 #ifdef CONFIG_MTD_PARTITIONS
-	int			nr_parts;
 	struct mtd_partition	*parts;
 #endif
 };
 
-static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
 #ifdef CONFIG_MTD_PARTITIONS
-static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
-#endif
+#define OF_FLASH_PARTS(info)	((info)->parts)
 
-#ifdef CONFIG_MTD_PARTITIONS
-static int parse_flash_partitions(struct device_node *node,
-		struct mtd_partition **parts)
+static int parse_obsolete_partitions(struct of_device *dev,
+				     struct of_flash *info,
+				     struct device_node *dp)
 {
-	int i, plen, retval = -ENOMEM;
-	const  u32  *part;
-	const  char *name;
-
-	part = of_get_property(node, "partitions", &plen);
-	if (part == NULL)
-		goto err;
-
-	retval = plen / (2 * sizeof(u32));
-	*parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
-	if (*parts == NULL) {
-		printk(KERN_ERR "Can't allocate the flash partition data!\n");
-		goto err;
-	}
+	int i, plen, nr_parts;
+	const struct {
+		u32 offset, len;
+	} *part;
+	const char *names;
+
+	part = of_get_property(dp, "partitions", &plen);
+	if (!part)
+		return 0; /* No partitions found */
+
+	dev_warn(&dev->dev, "Device tree uses obsolete partition map binding\n");
+
+	nr_parts = plen / sizeof(part[0]);
+
+	info->parts = kzalloc(nr_parts * sizeof(*info->parts), GFP_KERNEL);
+	if (!info->parts)
+		return -ENOMEM;
 
-	name = of_get_property(node, "partition-names", &plen);
+	names = of_get_property(dp, "partition-names", &plen);
 
-	for (i = 0; i < retval; i++) {
-		(*parts)[i].offset = *part++;
-		(*parts)[i].size   = *part & ~1;
-		if (*part++ & 1) /* bit 0 set signifies read only partition */
-			(*parts)[i].mask_flags = MTD_WRITEABLE;
+	for (i = 0; i < nr_parts; i++) {
+		info->parts[i].offset = part->offset;
+		info->parts[i].size   = part->len & ~1;
+		if (part->len & 1) /* bit 0 set signifies read only partition */
+			info->parts[i].mask_flags = MTD_WRITEABLE;
 
-		if (name != NULL && plen > 0) {
-			int len = strlen(name) + 1;
+		if (names && (plen > 0)) {
+			int len = strlen(names) + 1;
 
-			(*parts)[i].name = (char *)name;
+			info->parts[i].name = (char *)names;
 			plen -= len;
-			name += len;
-		} else
-			(*parts)[i].name = "unnamed";
+			names += len;
+		} else {
+			info->parts[i].name = "unnamed";
+		}
+
+		part++;
 	}
-err:
-	return retval;
+
+	return nr_parts;
 }
-#endif
 
-static int of_physmap_remove(struct of_device *dev)
+static int __devinit parse_partitions(struct of_flash *info,
+				      struct of_device *dev)
+{
+	const char *partname;
+	static const char *part_probe_types[]
+		= { "cmdlinepart", "RedBoot", NULL };
+	struct device_node *dp = dev->node, *pp;
+	int nr_parts, i;
+
+	/* First look for RedBoot table or partitions on the command
+	 * line, these take precedence over device tree information */
+	nr_parts = parse_mtd_partitions(info->mtd, part_probe_types,
+					&info->parts, 0);
+	if (nr_parts > 0) {
+		add_mtd_partitions(info->mtd, info->parts, nr_parts);
+		return 0;
+	}
+
+	/* First count the subnodes */
+	nr_parts = 0;
+	for (pp = dp->child; pp; pp = pp->sibling)
+		nr_parts++;
+
+	if (nr_parts == 0)
+		return parse_obsolete_partitions(dev, info, dp);
+
+	info->parts = kzalloc(nr_parts * sizeof(*info->parts),
+			      GFP_KERNEL);
+	if (!info->parts)
+		return -ENOMEM;
+
+	for (pp = dp->child, i = 0; pp; pp = pp->sibling, i++) {
+		const u32 *reg;
+		int len;
+
+		reg = of_get_property(pp, "reg", &len);
+		if (!reg || (len != 2*sizeof(u32))) {
+			dev_err(&dev->dev, "Invalid 'reg' on %s\n",
+				dp->full_name);
+			kfree(info->parts);
+			info->parts = NULL;
+			return -EINVAL;
+		}
+		info->parts[i].offset = reg[0];
+		info->parts[i].size = reg[1];
+
+		partname = of_get_property(pp, "label", &len);
+		if (!partname)
+			partname = of_get_property(pp, "name", &len);
+		info->parts[i].name = (char *)partname;
+
+		if (of_get_property(pp, "read-only", &len))
+			info->parts[i].mask_flags = MTD_WRITEABLE;
+	}
+
+	return nr_parts;
+}
+#else /* MTD_PARTITIONS */
+#define	OF_FLASH_PARTS(info)		(0)
+#define parse_partitions(info, dev)	(0)
+#endif /* MTD_PARTITIONS */
+
+static int of_flash_remove(struct of_device *dev)
 {
-	struct physmap_flash_info *info;
+	struct of_flash *info;
 
 	info = dev_get_drvdata(&dev->dev);
-	if (info == NULL)
+	if (!info)
 		return 0;
 	dev_set_drvdata(&dev->dev, NULL);
 
-	if (info->mtd != NULL) {
-#ifdef CONFIG_MTD_PARTITIONS
-		if (info->nr_parts) {
+	if (info->mtd) {
+		if (OF_FLASH_PARTS(info)) {
 			del_mtd_partitions(info->mtd);
-			kfree(info->parts);
+			kfree(OF_FLASH_PARTS(info));
 		} else {
 			del_mtd_device(info->mtd);
 		}
-#else
-		del_mtd_device(info->mtd);
-#endif
 		map_destroy(info->mtd);
 	}
 
-	if (info->map.virt != NULL)
+	if (info->map.virt)
 		iounmap(info->map.virt);
 
-	if (info->res != NULL) {
+	if (info->res) {
 		release_resource(info->res);
 		kfree(info->res);
 	}
@@ -115,47 +173,78 @@ static int of_physmap_remove(struct of_device *dev)
 	return 0;
 }
 
-static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
+/* Helper function to handle probing of the obsolete "direct-mapped"
+ * compatible binding, which has an extra "probe-type" property
+ * describing the type of flash probe necessary. */
+static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
+						  struct map_info *map)
 {
 	struct device_node *dp = dev->node;
-	struct resource res;
-	struct physmap_flash_info *info;
-	const char **probe_type;
 	const char *of_probe;
+	struct mtd_info *mtd;
+	static const char *rom_probe_types[]
+		= { "cfi_probe", "jedec_probe", "map_rom"};
+	int i;
+
+	dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
+		 "flash binding\n");
+
+	of_probe = of_get_property(dp, "probe-type", NULL);
+	if (!of_probe) {
+		for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
+			mtd = do_map_probe(rom_probe_types[i], map);
+			if (mtd)
+				return mtd;
+		}
+		return NULL;
+	} else if (strcmp(of_probe, "CFI") == 0) {
+		return do_map_probe("cfi_probe", map);
+	} else if (strcmp(of_probe, "JEDEC") == 0) {
+		return do_map_probe("jedec_probe", map);
+	} else {
+		if (strcmp(of_probe, "ROM") != 0)
+			dev_warn(&dev->dev, "obsolete_probe: don't know probe "
+				 "type '%s', mapping as rom\n", of_probe);
+		return do_map_probe("mtd_rom", map);
+	}
+}
+
+static int __devinit of_flash_probe(struct of_device *dev,
+				    const struct of_device_id *match)
+{
+	struct device_node *dp = dev->node;
+	struct resource res;
+	struct of_flash *info;
+	const char *probe_type = match->data;
 	const u32 *width;
 	int err;
 
-
+	err = -ENXIO;
 	if (of_address_to_resource(dp, 0, &res)) {
-		dev_err(&dev->dev, "Can't get the flash mapping!\n");
-		err = -EINVAL;
+		dev_err(&dev->dev, "Can't get IO address from device tree\n");
 		goto err_out;
 	}
 
-       	dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
-	    (unsigned long long)res.end - res.start + 1,
-	    (unsigned long long)res.start);
+       	dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",
+		(unsigned long long)res.start, (unsigned long long)res.end);
 
-	info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
-	if (info == NULL) {
-		err = -ENOMEM;
+	err = -ENOMEM;
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
 		goto err_out;
-	}
 
 	dev_set_drvdata(&dev->dev, info);
 
+	err = -EBUSY;
 	info->res = request_mem_region(res.start, res.end - res.start + 1,
-			dev->dev.bus_id);
-	if (info->res == NULL) {
-		dev_err(&dev->dev, "Could not reserve memory region\n");
-		err = -ENOMEM;
+				       dev->dev.bus_id);
+	if (!info->res)
 		goto err_out;
-	}
 
+	err = -ENXIO;
 	width = of_get_property(dp, "bank-width", NULL);
-	if (width == NULL) {
-		dev_err(&dev->dev, "Can't get the flash bank width!\n");
-		err = -EINVAL;
+	if (!width) {
+		dev_err(&dev->dev, "Can't get bank width from device tree\n");
 		goto err_out;
 	}
 
@@ -164,87 +253,87 @@ static int __devinit of_physmap_probe(struct of_device *dev, const struct of_dev
 	info->map.size = res.end - res.start + 1;
 	info->map.bankwidth = *width;
 
+	err = -ENOMEM;
 	info->map.virt = ioremap(info->map.phys, info->map.size);
-	if (info->map.virt == NULL) {
-		dev_err(&dev->dev, "Failed to ioremap flash region\n");
-		err = EIO;
+	if (!info->map.virt) {
+		dev_err(&dev->dev, "Failed to ioremap() flash region\n");
 		goto err_out;
 	}
 
 	simple_map_init(&info->map);
 
-	of_probe = of_get_property(dp, "probe-type", NULL);
-	if (of_probe == NULL) {
-		probe_type = rom_probe_types;
-		for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
-			info->mtd = do_map_probe(*probe_type, &info->map);
-	} else if (!strcmp(of_probe, "CFI"))
-		info->mtd = do_map_probe("cfi_probe", &info->map);
-	else if (!strcmp(of_probe, "JEDEC"))
-		info->mtd = do_map_probe("jedec_probe", &info->map);
-	else {
- 		if (strcmp(of_probe, "ROM"))
-			dev_dbg(&dev->dev, "map_probe: don't know probe type "
-			"'%s', mapping as rom\n", of_probe);
-		info->mtd = do_map_probe("mtd_rom", &info->map);
-	}
-	if (info->mtd == NULL) {
-		dev_err(&dev->dev, "map_probe failed\n");
-		err = -ENXIO;
+	if (probe_type)
+		info->mtd = do_map_probe(probe_type, &info->map);
+	else
+		info->mtd = obsolete_probe(dev, &info->map);
+
+	err = -ENXIO;
+	if (!info->mtd) {
+		dev_err(&dev->dev, "do_map_probe() failed\n");
 		goto err_out;
 	}
 	info->mtd->owner = THIS_MODULE;
 
-#ifdef CONFIG_MTD_PARTITIONS
-	err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
-	if (err > 0) {
-		add_mtd_partitions(info->mtd, info->parts, err);
-	} else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
-		dev_info(&dev->dev, "Using OF partition information\n");
-		add_mtd_partitions(info->mtd, info->parts, err);
-		info->nr_parts = err;
-	} else
-#endif
+	err = parse_partitions(info, dev);
+	if (err < 0)
+		goto err_out;
+
+	if (err > 0)
+		add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err);
+	else
+		add_mtd_device(info->mtd);
 
-	add_mtd_device(info->mtd);
 	return 0;
 
 err_out:
-	of_physmap_remove(dev);
+	of_flash_remove(dev);
 	return err;
 }
 
-static struct of_device_id of_physmap_match[] = {
+static struct of_device_id of_flash_match[] = {
+	{
+		.compatible	= "cfi-flash",
+		.data		= (void *)"cfi_probe",
+	},
+	{
+		/* FIXME: JEDEC chips can't be safely and reliably
+		 * probed, although the mtd code gets it right in
+		 * practice most of the time.  We should use the
+		 * vendor and device ids specified by the binding to
+		 * bypass the heuristic probe code, but the mtd layer
+		 * provides, at present, no interface for doing so
+		 * :(. */
+		.compatible	= "jedec-flash",
+		.data		= (void *)"jedec_probe",
+	},
 	{
 		.type		= "rom",
 		.compatible	= "direct-mapped"
 	},
 	{ },
 };
+MODULE_DEVICE_TABLE(of, of_flash_match);
 
-MODULE_DEVICE_TABLE(of, of_physmap_match);
-
-
-static struct of_platform_driver of_physmap_flash_driver = {
-	.name		= "physmap-flash",
-	.match_table	= of_physmap_match,
-	.probe		= of_physmap_probe,
-	.remove		= of_physmap_remove,
+static struct of_platform_driver of_flash_driver = {
+	.name		= "of-flash",
+	.match_table	= of_flash_match,
+	.probe		= of_flash_probe,
+	.remove		= of_flash_remove,
 };
 
-static int __init of_physmap_init(void)
+static int __init of_flash_init(void)
 {
-	return of_register_platform_driver(&of_physmap_flash_driver);
+	return of_register_platform_driver(&of_flash_driver);
 }
 
-static void __exit of_physmap_exit(void)
+static void __exit of_flash_exit(void)
 {
-	of_unregister_platform_driver(&of_physmap_flash_driver);
+	of_unregister_platform_driver(&of_flash_driver);
 }
 
-module_init(of_physmap_init);
-module_exit(of_physmap_exit);
+module_init(of_flash_init);
+module_exit(of_flash_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
-MODULE_DESCRIPTION("Configurable MTD map driver for OF");
+MODULE_DESCRIPTION("Device tree based MTD map driver");